Collimating Lens from Throlabs for LED


LED has a small protective dome over the diode that is commonly known as the primary optic that serves to protect and shape the output of the small diode. But light from the primary optic of the LED is broad for most application and lacks intensity for long distance. To reduce this drawback LED fixtures use secondary fixtures like collimating lens from Thorlabs or other labs, reflectors, TIR optics etc that collects light and magnifies its intensity towards the target.

If you wish to create lenses and reflectors for LEDs, then you need to use some logical ways apart from just scaling them down from the light source. This is because LED has much smaller form factors than other light sources and also differs in the way it emits light.

Use of collimating lens in LED  
     
The collimating lens of the LED undergoes the process of Total Internal Reflection or TIR. TIR is defined as the complete reflection of a ray of light within a medium such as water or glass from the surrounding medium into the medium. This phenomenon occurs if the angle of incidence is greater than a certain limiting angle called the critical angle.

The collimating lens of Thorlabs that are used in LED captures the emission of a light source and gain control over it. The led exhibit lens like features at the entrance and the exit surface and sometimes in the additional, micro or Fresnel lenses for shaping the beam further.
A collimator used in LED protects it from the surroundings if designed accordingly.


Location: Australia

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